| 摘要 |
PROBLEM TO BE SOLVED: To develop a copper smelting process without using a PS converter, etc. SOLUTION: In a blast furnace where molten-state matte that is produced from a smelting furnace and usually contains 50 to 70% of copper is converted by air draft into 96 to 99% blister copper, a tuyere which is 10 to 30 mm in inside diameter, slanted downward at an angle of 4 to 35 degrees and mounted on a refractory is dipped in the molten matte, and is retained at 200 to 500 mm deep in the molten-state matte to feed air containing 18 to 60% of oxygen into the molten metal at the air velocity of 300 to 700 Nm per second at the tuyere exit.
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